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02 Silverado z71 rear end issues


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king
New User

Feb 23, 2012, 8:56 PM

Post #1 of 4 (4630 views)
02 Silverado z71 rear end issues Sign In

02 Chevrolet Silverado 1500 LS Z-71 regular cab short bed. 5.3 liter gas. 98000 miles. G80 rear end.

I have been having an intermittent metal rubbing sound coming from the rear end for the past several months. The most common situation where it occurs is going around a sharp right hand curve with a good bit of speed. I thought it was brakes at first and had firestone do the rear brakes. The problem persisted. I thought myself it might be the outer wheel bearing as the sound seems to come from the rear left side. I took it to a Chevy dealership and they could find nothing wrong. Then I tried a local shop and they drove it around and could not produce the noise I was hearing. They had it on the lift and could hear some light noise coming from the rear end. They thought it might be the clutch in the rear end. I had them service the rear end and a small piece of a tooth came out with the old gear oil. The sound persists, but seems to be muffled a bit now which makes me think the new oil affected it and the problem is in the rear end and not a wheel bearing. I am guessing I am at a point of rebuilding or replacing. Should I have someone rebuild my rear end? Can I buy an aftermarket rear differential and that bolt up and work? What should I do here?


re-tired
Veteran / Moderator
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Feb 23, 2012, 9:28 PM

Post #2 of 4 (4595 views)
Re: 02 Silverado z71 rear end issues Sign In

You did not say if it was a posi rear end or not . If it is there is a additive that must be added to the fluid . BUT if you have piece of internal workings if its a tooth its probably a side (spider) gear, in the oil you may consider getting it rebuilt or a low milage salvage complete axle. Either way be sure to get the same ratio.


LIFE'S SHORT GO FISH


king
New User

Feb 23, 2012, 9:45 PM

Post #3 of 4 (4590 views)
Re: 02 Silverado z71 rear end issues Sign In

It's a posi-track rear end. The guys at the shop I spoke to spoke of the additive having to be added to the fluid, so I assume they did it. I thought about trying to find a used rear axle assembly, but craigslist and a few salvage yard inventory checks have yielded no results. I'm in Arkansas and rear lockers are prime pieces of equipment here. Would a rebuild be economical parts/labor wise over getting an aftermarket rear differential? I have read the G80 rear ends are subject to failure with hard use and I would believe it. I have never towed anything or hailed over 400 pounds in it, and that was like twice.


re-tired
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Feb 23, 2012, 11:25 PM

Post #4 of 4 (4582 views)
Re: 02 Silverado z71 rear end issues Sign In

If your going to keep truck and its in good shape then in my experiance an Aurburn posi unit is top of the line.I've installed several in everything from a stock truck to a mud racer. Expect to drop $500+ - P&L . If too rich for you ,go to a dealer and order a set of spider gears,have a shop install.


Auburn, Lockers, Eaton Posi Units for Cars & Trucks


LIFE'S SHORT GO FISH






 
 
 






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